Cita APA (7a ed.)

Willke, J. C., & Willke, B. (1988). Abortion: Questions & answers. Hayes.

Cita Chicago Style (17a ed.)

Willke, J. C., y Barbara Willke. Abortion: Questions & Answers. Cincinnati: Hayes, 1988.

Cita MLA (9a ed.)

Willke, J. C., y Barbara Willke. Abortion: Questions & Answers. Hayes, 1988.